Why is ringless voicemail supported?
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As far as I can tell, ringless voicemail (used by telemarketers to leave a prerecorded voicemail without ringing the phone) is a practice that could be trivially detected or disabled. Unlike voice calls that are ultimately useful but can be abused by spammers, ringless voicemail drops have no legitimate use and yet Verizon's backbone seems to allow it. I'm curious: why?
Given that there is no reason for an entity to use a ringless voicemail other than to attempt to skirt Do-Not-Call rules, why not just disable the functionality entirely at the network level?
Who I have the same questioned this topic